The expansion will feature the Chosen, alien heroes who each have their own distinct personalities, fighting styles and skills. The Assassin is an honor-bound character who is skilled in stealth and close-quarters combat, while there's also the Hunter and Warlock. The Chosen will grow stronger as players battle against them over the course of the game.

Additionally, three factions are featured, including the Reaper, who are stealth marksman, as well as Skirmishers, who are defectors from the alien army, and Templars, who build up power over multiple attacks. Players will have to win over each faction in War of the Chosen.

The sequel to the award-winning strategy title XCOM: Enemy Unknown, XCOM 2 transports players 20 years into the future, where humanity lost the war against the alien threat that has established a new world order.